Daniel Stenberg wrote:
On Mon, 13 Dec 2010, Dmitri Shubin wrote:
Is CURLMOPT_PIPELINING supposed to work with FTP transfers?
No. I actually think the docs is pretty clear on this:
Yes, but to my surprise I found that enabling it leads to using single
connection for multiple FTP transfers from the same server.
When I start 2 FTP downloads from the same server using multi
interface with this option enabled only one download succeeded.
That's a bug then!
Can you provide source code for a small application that experiences
this failure to help us debug this?
I use modified version of 'multi-double.c' example
(docs/examples/multi-double.c in libcurl 7.21.2 distribution).
Here is a patch to it:
11a12,13
> #include <assert.h>
>
21a24,47
> FILE *log_file = NULL;
>
> static int debug_func(CURL *curl_handle, curl_infotype info, char
*ptr, size_t size, void *userdata)
> {
> char c = ptr[size];
> ptr[size] = '\0';
> switch (info) {
> case CURLINFO_HEADER_IN:
> fprintf(log_file, "%p\t< %s", curl_handle, ptr);
> break;
> case CURLINFO_HEADER_OUT:
> fprintf(log_file, "%p\t> %s", curl_handle, ptr);
> break;
> }
> ptr[size] = c;
> fflush(log_file);
> return 0;
> }
>
> static size_t write_func(void *ptr, size_t size, size_t nmemb, void
*userdata)
> {
> return size*nmemb;
> }
>
32a59,60
> log_file = fopen("curl.log", "w");
>
37c65,68
< curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.example.com/";);
---
> curl_easy_setopt(http_handle, CURLOPT_URL,
"ftp://ftp.kernel.org/bin/compress";);
> assert(curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION,
debug_func) == CURLE_OK);
> assert(curl_easy_setopt(http_handle, CURLOPT_VERBOSE, (long)1) ==
CURLE_OK);
> assert(curl_easy_setopt(http_handle, CURLOPT_WRITEFUNCTION,
write_func) == CURLE_OK);
40c71,74
< curl_easy_setopt(http_handle2, CURLOPT_URL, "http://localhost/";);
---
> curl_easy_setopt(http_handle2, CURLOPT_URL,
"ftp://ftp.kernel.org/bin/ls";);
> assert(curl_easy_setopt(http_handle2, CURLOPT_DEBUGFUNCTION,
debug_func) == CURLE_OK);
> assert(curl_easy_setopt(http_handle2, CURLOPT_VERBOSE, (long)1) ==
CURLE_OK);
> assert(curl_easy_setopt(http_handle2, CURLOPT_WRITEFUNCTION,
write_func) == CURLE_OK);
43a78
> curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, (long)1);
Thanks!
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